My 1983 300SD has a non working Tach. I bought a new tach amp diagnostic module (under garbage can under the hood) from someone that was referred here. The green LED lights up but I get no reading from the red blinking LED. When you put the key in glow with this module, the tach powers up to 6000 and back down as a test. So I know the tach is working. I started looking around and that brings me to where I think the issue is? There is a pickup mounted above the harmonic balancer and I think its broken. I took a pic and posted it here. Is that pickup coil in the right spot. It looks like the bracket is broken. Where is it exactly suppose to sit. Does anyone have a pic of what a working one looks like? I don't even know if there is something missing. Thanks for helping me out.

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2022 Nissan Frontier Pro4x
1990 Mercedes 420SEL
1950 Packard 8

Previous German cars-
2001 Mercedes SL500
1983 Mercedes 300SD
2011 BMW 328i (manual)
2008 BMW 535xi (manual)
2006 BMW M3 (manual)
1980 Mercedes 300TD
2006 BMW 750i
1996 Mercedes E300D
1994 BMW 740i
2006 BMW 330xi (manual)
1999 E300DT Smoke silver/black 253k
2012 BMW 535i Xdrive M-Sport
1984 300TD-T 304k
1988 Mercedes 560SEL (parts car)
2010 BMW 550i xdrive
2017 Audi A4 Presitge
1979 300SD 313k
2003 E500 189k